Qingdao Haier Air-Conditioning Electronic Co., Ltd.

Haier Smart Home Co., Ltd.

Wanhua Chemical Group Co., Ltd.

Wanhua Chemical (Ningbo) Co., Ltd.

Qingdao Haier Air Conditioner General Corp., Ltd.

Bin Shi

Shaojiang Cheng

Baitian Zhuo

Jun Wang

Ruigang Zhang

Yuan Li

Yonghua Shang

Defang Guo

Weiqi Hua

Wei Liu

Kun Yang

Yuqi Wang

Nuancheng Wang

Benhai Yuan

Lidong Sun

Zhicheng Zhu

Chengyue Yan

Bo Zhang

Bing Zheng

Li Li

Weijing Fan

Haijun Li

Zongke Wei

Yuhui Gao

Xianghui Hu

Yan Geng

Haizhu Shao

Anping Cong

Biao Wang

Ensen Ma

Wenjun Shao

Wanying Zhang

Xiuge Li

Hefu Li

Wanchao Ding

Peng Chen

Yueyuan Si

The present invention provides an isocyanurate-containing polyisocyanate composition with stable chromaticity, and a preparation method thereof, belonging to the technical field of polyisocyanate composition preparation. The preparation method comprises: an isocyanate monomer being polymerized in the presence of a catalyst, after the reaction is terminated, obtaining a prepolymer, subjecting the prepolymer to separation treatment and heat treatment, and obtaining the polyisocyanate composition containing isocyanurate; based on the weight of the polyisocyanate composition, the cleavable amine content of the polyisocyanate composition is less than or equal to 20 ppm. By means of controlling the cleavable amine content of the polyisocyanate composition, the present invention causes the resulting isocyanurate-containing polyisocyanate composition to have stable storage chromaticity, and the present invention has a chrominance increase of ≤10 Hazen when stored at 40° C. for 12 months.

Isocyanurate-containing polyisocyanate composition with stable chromaticity, and preparation method thereof

The present application provides a storage-stable polyisocyanate composition and a preparation method. The polyisocyanate composition is obtained by selecting one or more diisocyanate from aliphatic diisocyanates and alicyclic diisocyanates, and reacting same with an alcohol compound; the polyisocyanate composition contains an isocyanurate group, a uretdione group, a carbamate group, and an allophanate group; within the polyisocyanate composition, the molar ratio of the carbamate group/(uretdione group+isocyanurate group) is 0.01-0.2, and preferably 0.01-0.1. Compared to existing techniques, the present application has the advantage of a noticeable increase in system viscosity of uretdione polyisocyanate during storage. With the present application, by means of controlling the ratio of the carbamate group/(uretdione group+isocyanurate group) within the system, the increase in viscosity of a product during storage is inhibited, thereby improving the storage stability of the product.

Storage-stable polyisocyanate composition and preparation method

A control method for a multi-split air conditioning system capable of simultaneous cooling and heating to solve the problem that uneven cooling and heating occurs when running an existing multi-split air conditioning system. The method includes calculating the cooling or heating temperature effect deviation of each indoor unit on the basis of the indoor ambient temperature and set temperature of the environment where each indoor unit is located; calculating the total cooling effect deviation and total heating effect deviation of an multi-split air conditioning system on the basis of the horsepower of all the indoor units and the corresponding cooling temperature deviation or heating temperature deviation; and selectively adjusting the degrees of opening of valve boxes on the basis of the total cooling effect deviation and the total heating effect deviation. The method ensures balanced distribution of refrigerant, balanced running effects the units, and avoids uneven heating and cooling.

Control method for multi-split air conditioning system capable of simultaneous cooling and heating

An expansion valve control method for a multi-split air-conditioning system to solve the problem of detecting leakage of an expansion valve of a multi-split air-conditioning system. The system includes an outdoor unit and a plurality of indoor units connected to the outdoor unit, each of the indoor units is connected to the outdoor unit by a first pipeline and a second pipeline. The expansion valve control method includes acquiring an indoor temperature of an environment where an indoor unit is located; acquiring the temperature of a first pipeline of the indoor unit and the temperature of a second pipeline of the indoor unit when the indoor unit is in a shutdown state; and according to at least the indoor temperature of the environment where the indoor unit is located, determining the leakage condition of an expansion valve of the indoor unit.

Expansion valve control method for multi-connection air-conditioning system

A method for controlling the balanced frosting of outdoor units in a multi-split air-conditioning system solving the problem in existing multi-split air-conditioning systems of resource waste caused by a low utilization efficiency of the heating capability of outdoor units as a result of some of the outdoor units entering a defrosting state when the heating capability is not fully utilized. According to the control method, by determining whether an outdoor unit set satisfies a frosting unbalance condition, the actual output capability of outdoor units of the outdoor unit set is selectively controlled on the basis of the frosting degrees of all the outdoor units. Thus, the difference between the frosting degrees of different outdoor units in the outdoor unit set at the same time can be reduced, such that the heating capability of all the outdoor units can be fully utilized when the outdoor unit set enters a defrosting state.

Method for controlling balanced frosting of outdoor units in multi-split air-conditioning system

The present invention discloses a method and an apparatus for controlling an air conditioner, and a computer storage medium, and relates to the technical field of intelligent household appliances. The method includes acquiring a current physical characteristic parameter of an air conditioner user in a current sampling timeframe; and adjusting either or both of a current set temperature and a current compressor frequency of the air conditioner according to the current physical characteristic parameter and current energy consumption of the air conditioner when the current physical characteristic parameter falls within a set range of parameters in sleep. Therefore, energy conservation and a comfortable user experience are compatible, thereby providing more functions for the control of the air conditioner in the sleep mode.

Air conditioner control method and device, and computer storage medium

The present application relates to a method for communication detection. The method comprises: determining a length level of a communication link according to a time length of pulse data during transmission of data over the communication link, and determining a detection time point according to the length level of the communication link. The length level of the communication link is determined according to the time length of pulse data during transmission of data over the communication link, and then the detection time point of the data is confirmed, thereby realizing dynamic determination of the detection time point of data according to the time length of the pulse data, and data waveform attenuation caused by an excessively long distance is avoided by means of automatic adjustment of the detection time point, so that the correctness of data detection is ensured, and the stability of long-distance homebus communication is improved.

Method and device for communication detection and air conditioner

A relay device and a multi-split control system that achieve reliable communication between an outdoor air conditioning unit and multiple indoor units under the condition that the length of a communication bus is limited. The system expands the communication distance by a cascade path formed by a plurality of relay devices. The cascade path transmits control signals sent by a master control device/a specific slave control device (i.e. a slave control device communicating with the master control device or certain relay device) to corresponding slave control devices one by one, and the corresponding slave control devices transmit the signals to the master control device/specific slave control device according to a response signal fed back by the control signal, where the relay devices may respectively communicate with a source node device and a destination node device on the basis of the master-slave type communication mode.

Relay device and multi-split air-conditioning control systems

An oil return control method for a multi-split air conditioner and a system accomplishing the same includes: calculating an average exhaust pressure within an oil return period Pd_AVG; determining whether the average exhaust pressure Pd_AVG&#x2265;the set threshold Pd; if Pd_AVG&#x2265;Pd, maintaining the multi-split air conditioner working in heating mode to ensure an acceptable oil return performance without affecting the air conditioning effect of indoor unit in heating mode; if Pd_AVG&#x3c;Pd, switching the multi-split air conditioner to cooling mode, stopping a fan within those power-on indoor units and entering into a cooling oil return process and switching the multi-split air conditioner back to heating mode until the cooling oil return process ends.

VRV oil return control method and system

Embodiments of the present disclosure provide a protection circuit and an air conditioner, which are applied to the field of air conditioner technologies and used to protect an indoor unit. The protection circuit provided by the embodiments of the present disclosure includes: a positive temperature coefficient thermistor; a signal input terminal; and a communication module; wherein a first end of the positive temperature coefficient thermistor is connected to the signal input terminal, and a second end of the positive temperature coefficient thermistor is connected to the communication module.

Protection circuit and air conditioner

Devices are provided for field weakening control of a compressor, including the compressor and a main circuit unit providing power for the compressor. The devices include a compressor rotational speed obtaining unit, and a control unit that compares the rotational speed &#x3c9; of the compressor with a rotational speed threshold &#x3c9;of the compressor, and controls the main circuit unit according to comparison results. When the rotational speed &#x3c9; is less than &#x3c9;, an output voltage of the main circuit unit is controlled at a fixed value. When the rotational speed &#x3c9; is greater than or equal to &#x3c9;, the compressor is controlled not to enter the field weakening control temporarily and the output voltage of the main circuit unit is controlled to rise, the compressor is controlled to enter the field weakening control when the output voltage of the main circuit unit cannot continue to rise.

Device and method for field weakening control of compressor, air conditioner and storage medium

The present disclosure relates to a method for controlling communication compensation, comprising: determining a length class of a communication link according to a time length of pulse data transmitted on the communication link; and determining a compensation scheme for communication compensation according to the length class of the communication link. In the invention, a length class of a communication link determined according to a time length of pulse data transmitted on the communication link is used to determine a compensation scheme for communication compensation so as to perform time compensation on data, thereby preventing attenuation caused by an excessively long communication distance, and improving the stability of long-distance communication performed by means of Homebus. Also disclosed are an apparatus for controlling communication compensation, and an air conditioner.

Method and apparatus for controlling communication compensation, and air conditioner

The present disclosure disclosures a method and an apparatus for controlling a device. The method is applied in an indoor unit of a multi-split system and includes: when a temperature sensor fails, selecting other indoor units operating in the same operation mode with a current indoor unit from all indoor units; obtaining corresponding sensor parameters from temperature sensors of the indoor units operating in the same operation mode; and controlling the device according to the obtained sensor parameters.

Method and apparatus for controlling device

An address competition method of a multi-connected type control system. The method aims at solving the problem of how to set an indoor machine communication address in the multi-connected type air conditioner system efficiently. For the purpose, a primary control device (such as an air conditioner outdoor machine) performs broadcasting on each address in a preset address section in sequence. A slave control device (such as the air conditioner indoor machine) responds to the primary control device on the basis of preset responding time and the number of currently broadcasting times of the primary control device. The primary control device to which a communication address is distributed temporarily is responded so as to finish address competition rapidly. Meanwhile, the primary control device can perform continuous broadcasting on one address for repeatedly, so that the competition success rate of the address is increased.

Address competition method of multi-connected type control system

A defrosting control method for a multi-split system is provided. A multi-split system comprises an outdoor unit and multiple indoor units. An expansion valve is provided on a connecting pipeline between each of the indoor units and the outdoor unit. When the expansion valve of each activated indoor unit is closed and the degree of opening of the expansion valve of each off-state indoor unit is less than or equal to a maximum set degree of opening, the system satisfies a defrosting requirement, and as a result the method controls the expansion valve of each activated indoor unit to remain closed, thereby resolving the issue of a dramatic temperature drop in a room having an activated indoor unit during defrosting and improving user satisfaction. The degree of opening of the expansion valve of a off-state indoor unit is Off_PLS, and is controlled such that Off_PLS=ALL_HP*Avg_PLS/Off_HP. The invention satisfies a defrosting requirement and reduces the degree of opening of the expansion valves as much as possible, thereby preventing damage to a compressor without affecting defrosting.

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Qingdao, China

Bin Shi